export default {
	namespaced: true, // vue3的 vuex是ed结尾的
	// 模块的 state 数据
	state: () => ({
		// 购物车的数组，用来存储购物车中每个商品的信息对象
		// 每个商品的信息对象，都包含如下 6 个属性：
		// { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
		cart: JSON.parse(uni.getStorageSync('cart') || '[]'),
	}),

	// 模块的 mutations 方法
	mutations: {
		addToCart(state, goods) {
			const findRes = state.cart.find(x => x.goods_id === goods.goods_id)
			if (!findRes) {
				state.cart.push(goods)
			} else {
				findRes.goods_count += 1
			}
			this.commit('cart/saveToStorage')
		},
		saveToStorage(state) {
			uni.setStorageSync('cart', JSON.stringify(state.cart))
		},
		updateGoodsState(state, goods) { // 更新商品状态
			const findRes = state.cart.find(x => x.goods_id === goods.goods_id)
			if (findRes) {
				findRes.goods_state = goods.goods_state
				this.commit('cart/saveToStorage')
			}
		},
		updateGoodsCount(state, goods) {
			const findRes = state.cart.find(x => x.goods_id === goods.goods_id)
			if (findRes) {
				findRes.goods_count = goods.goods_count
				this.commit('cart/saveToStorage')
			}
		},
		removeCartById(state, goods) {
			state.cart = state.cart.filter(x => x.goods_id !== goods.goods_id)
			this.commit('cart/saveToStorage')
		},
		updateAllGoodsState(state, newState) {
			state.cart.forEach(item => item.goods_state = newState)
			this.commit('cart/saveToStorage')
		},
	},

	// 模块的 getters 属性
	getters: {
		total(state) {
			let c = 0
			state.cart.forEach(goods => c += goods.goods_count)
			return c
		},
		checkCount(state) {
			return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
		},
		checkNum(state) {
			return state.cart
				.filter(x => x.goods_state)
				.reduce((total, item) => total += (item.goods_count * item.goods_price), 0)
		}
	},
}